PARK CITY, Utah -- "Girlfight," Karyn Kusama's story of a tough Brooklyn girl who wants to be a boxer, and "You Can Count on Me," Kenneth Lonergan's story of an orphaned brother and sister who uneasily get to know each other as adults, shared the grand jury prize for best dramatic film here Saturday at the Sundance Film Festival. In addition, Lonergan won the Waldo Salt screenwriting award, and Kusama was picked as best director.